Malicious PDF — malware analysis report

Static analysis result for SHA-256 df51090803db0dfa…

MALICIOUS

PDF

107.7 KB Created: 2021-09-06 19:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 084f81fd62b245e29b4f01d9f3ea411c SHA-1: 256259a84cbdf6429f4f3b3aad7db1f7e620e4d7 SHA-256: df51090803db0dfab7b6412e5c9ddae758afb3cdf0cae1faa7c752065dbf2186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites. These links likely serve as a lure to redirect users to malicious content, such as phishing pages or malware downloads. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt at SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3knu228hsf9faa9r49hg8ermuh/meduvajawedawun.pdf In PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d93c1a4d---pegudijunajege.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f84bf9b9---34574640661.pdfIn PDF document text
    • http://c-six.it/userfiles/files/pasanupinopifaxadixeju.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c41a21bca0---bomip.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f2cd00a8a19340c3c59bd71db8efa755/29912168071.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/3137277968.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/wewoladekaxop.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/ledukidajelizumosunejit.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/52174129948.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/10006b23add77395da735cdfeda91b36/gufupuv.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a84211de30e---4365561482.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/patifabo.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/kubuxekawoxeje.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607463be6f391---vipofugusaxokagabolodur.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0abfeb665c---gunojo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/hi21sf7i82d2arsclefbholqq6/37332967759.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/78792690635.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc2a73aec2---rokofumifikoropemoli.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/50595676169.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9v1ct07m33mbuetmuc1ol0bgh4/45053273941.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9j23vhc8r8i4o1en73n3t3ra8b/94729170451.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/22410926524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=elsevier+journals+list+pdf+with+impact+factorPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 20068 bytes
SHA-256: b1136a9a14e07695f2097d4760e5f1b35c6997e9b4b024f68146a79b826cd471
font_01_sfnt_off00016e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8E 11252 bytes
SHA-256: d652bfec05778becf4fe15529fed590a3f94fd1eef62f9b900d10bdbc0c84590
font_02_sfnt_off000188c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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